JP2003213061A - Vinyl chloride-based resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vinyl chloride-based resin composition having excellent impact resistance without deteriorating the original physical properties (tensile strength, tensile breaking elongation) of the vinyl chloride resin, and to provide a molded article. <P>SOLUTION: This vinyl chloride-based resin composition is characterized by comprising 100 pts.wt. of a vinyl chloride-based resin having a polymerization degree of 600 to 1,600 and 20 to 50 pts.wt. of at least two inorganic fillers, and a molded article comprising the composition. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vinyl chloride resin composition and a vinyl chloride resin molded product comprising the composition.

[0002]

2. Description of the Related Art Vinyl chloride resin is inexpensive, has excellent physical properties, and is excellent in molding processability.
It is molded into various shapes with an extruder or injection molding machine and is widely used for various purposes. Particularly, the hard vinyl chloride resin has excellent mechanical properties, chemical resistance, and weather resistance.
It is known to add an inorganic filler in order to improve the impact resistance of vinyl chloride resin.
As can be seen in Japanese Patent Laid-Open No. 5-106256, 5 to 25 parts of fine calcium carbonate is added to 100 parts by weight of vinyl chloride resin.
Impact resistance is improved by adding 0.1 to 5 parts by weight of hydrous silicic acid specified as parts by weight. However, when a large amount of inorganic filler is added, there is a drawback that other properties of the vinyl chloride resin (tensile yield strength, tensile breaking elongation, etc.) are deteriorated.

[0003]

The present invention has been made in view of the above problems, and an object thereof is to reduce the physical properties (tensile strength, tensile elongation at break) inherent to vinyl chloride resin. It improves impact resistance.

[0004]

The invention according to claim 1 (hereinafter referred to as invention 1) comprises 100 parts by weight of a vinyl chloride resin having a degree of polymerization of 600 to 1600 and at least two kinds of inorganic fillers 20 to 50. It is a vinyl chloride resin composition containing parts by weight.

The invention according to claim 2 (hereinafter referred to as invention 2)
Is the vinyl chloride resin composition according to claim 1, wherein the inorganic filler comprises a granular inorganic material and a layered inorganic material.

The invention according to claim 3 (hereinafter referred to as invention 3)
Is the vinyl chloride resin composition according to claim 1 or 2, wherein the granular inorganic material is contained in a larger amount than the layered inorganic material.

The invention according to claim 4 (hereinafter referred to as invention 4)
Is the vinyl chloride resin composition according to any one of claims 1 to 3, wherein the average particle size of the granular inorganic material is 1 to 10 µm.

The invention according to claim 5 (hereinafter referred to as invention 5)
Is a vinyl chloride resin composition according to any one of claims 1 to 4, wherein the granular inorganic material is calcium carbonate and the layered inorganic material is talc.

The invention according to claim 6 (hereinafter referred to as invention 6)
Is a vinyl chloride resin molded product using the vinyl chloride resin composition according to any one of Inventions 1 to 5.

In the present invention, the vinyl chloride resin means
Resin containing 50% by weight or more of vinyl chloride component, 50% by weight of vinyl chloride homopolymer, vinyl chloride
Examples of the above include copolymers with monomers copolymerizable therewith, and graft copolymers obtained by graft-copolymerizing vinyl chloride monomers with the polymers. These polymers may be used alone or in combination of two or more.

The monomer copolymerizable with vinyl chloride is, for example, α-, such as ethylene, propylene and butylene.
Olefin: Vinyl acetates such as vinyl acetate and vinyl propionate; Vinyl ethers such as butyl vinyl ether and cetyl vinyl ether; (meth) acrylic acid esters such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl acrylate, phenyl methacrylate Aromatic vinyls such as styrene and α-methylstyrene; Vinyl halides such as vinylidene chloride and vinylidene fluoride; N-substituted maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide. 1 type (s) or 2 or more types are used.

The polymer for graft-copolymerizing vinyl chloride is not particularly limited as long as it is a polymer for graft-polymerizing vinyl chloride. For example, ethylene-vinyl acetate copolymer; ethylene-vinyl acetate-carbon monoxide. Copolymer; ethylene-ethyl acrylate copolymer; ethylene-butyl acrylate-carbon monoxide copolymer; ethylene-methyl methacrylate copolymer; ethylene-propylene copolymer; acrylonitrile-butadiene copolymer; polyurethane; chlorine Polyethylene; chlorinated polypropylene and the like, and these may be used alone,
Two or more kinds may be used in combination.

The vinyl chloride resin used in the present invention uses a vinyl chloride monomer suspended or emulsified and dispersed in a liquid medium by a dispersant such as a suspension polymerization method or an emulsion polymerization method using a polymerization initiator. It is produced by a conventionally known method of polymerizing by, and more generally by a suspension polymerization method. The dispersant used in the suspension polymerization is not particularly limited as long as it is a generally used dispersant, and partially saponified polyvinyl acetate or a cellulose derivative may be used alone or in combination.

As the oil-soluble polymerization initiator, a known radical initiator generally used in the polymerization of vinyl chloride is used, and examples thereof include t-butylperoxy neodecanoate and t-hexylperoxy neodecanoate. Perester compounds such as acrylate, t-hexyl peroxypivalate, α-cumyl peroxyneodecanoate; percarbonate compounds such as diisopropyl peroxy carbonate, di-2-ethylhexyl peroxy dicarbonate, decanoyl peroxide, Examples thereof include peroxide compounds such as lauroyl peroxide and azo compounds such as α, α′-azobisisobutyronitrile, and at least one of them is used.

The average degree of polymerization of the vinyl chloride resin in the present invention is limited to 600 to 1600. Average degree of polymerization is 6
If it is less than 00, the impact resistance is inferior, and 16
If it exceeds 00, the melt viscosity becomes high and the workability deteriorates. The average degree of polymerization of the vinyl chloride resin was obtained by dissolving 5 g of the vinyl chloride resin in 100 g of tetrahydrofuran and removing the insoluble portion. Next, methanol was added to the soluble portion, and the precipitated component was filtered, dried and taken out, and then JIS K
It is the degree of polymerization determined according to 6721.

In the present invention, it is preferable that two or more kinds of inorganic fillers are used as the inorganic filler, and the granular inorganic material and the layered inorganic material are used in combination. The tensile strength is reduced only by the granular inorganic material, and only by the layered inorganic material. Impact resistance will be reduced.

The granular inorganic material has a granular shape,
There is no particular limitation as long as it is generally used as a resin reinforcing material or a filler, and among these, calcium carbonate is preferably used. Further, the average particle size of the granular inorganic material is preferably 1 to 10 μm, and when the average particle size is 1 μm or less or exceeds 10 μ, it becomes difficult to improve the impact resistance.

The layered inorganic substance is a plate-shaped, scaly, or flaky inorganic substance forming a layered structure. The layered inorganic substance used in the present invention is generally a resin reinforcing material,
There is no particular limitation as long as it can be used as a filler. Specific examples include talc mica hydrosaltite and the like, and the inner talc is preferably used.

The amount of the inorganic substance is 20 to 50 parts by weight with respect to 100 parts by weight of the vinyl chloride resin. If the amount is 20 parts by weight or less, the impact resistance is not improved, and if it exceeds 50 parts by weight, the tensile yield is increased. The effect of adding an inorganic substance cannot be obtained due to a decrease in strength and the like.

In the present invention, it is necessary that the amount of the particulate inorganic substance is contained in a larger amount than that of the layered inorganic substance. If the amount of the granular inorganic substance is less than the amount of the layered inorganic substance, tensile elongation and impact resistance will be reduced.

The vinyl chloride resin composition of the present invention contains, if necessary, stabilizers, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, ultraviolet absorbers, light stabilizers, Additives such as fillers and pigments may be contained.

The stabilizer is not particularly limited, and examples thereof include a heat stabilizer and a heat stabilization aid. The heat stabilizer is not particularly limited, for example, dibutyltin mercapto, dioctyltin mercapto, dimethyltin mercapto, dibutyltin mercapto, dibutyltin malate, dibutyltin malate polymer, dioctyltin malate, dioctyltin malate polymer, dibutyl. Organic tin stabilizers such as tin laurate and dibutyltin laurate polymers; lead stabilizers such as lead stearate, dibasic lead phosphite, and tribasic lead sulfate; calcium-zinc stabilizers; barium-zinc System stabilizers: barium-cadmium system stabilizers and the like. These may be used alone or in combination of two or more. The stabilizing aid is not particularly limited, and examples thereof include epoxidized soybean oil, phosphoric acid ester, and the like. These may be used alone or in combination of two or more.

Examples of the lubricant include internal lubricants and external lubricants. The internal lubricant is used for the purpose of reducing the flow viscosity of the molten resin during molding and preventing frictional heat generation. The internal lubricant is not particularly limited, and examples thereof include butyl stearate, lauryl alcohol, stearyl alcohol, epoxy soybean oil, glycerin monostearate, stearic acid, and bisamide. These may be used alone or in combination of two or more.
The external lubricant is used for the purpose of enhancing the sliding effect between the molten resin and the metal surface during molding. The external lubricant is not particularly limited, and examples thereof include paraffin wax, polyolefin wax, ester wax, montanic acid wax and the like. These may be used alone or in combination of two or more.

The processing aid is not particularly limited, and examples thereof include acrylic processing aids such as an alkyl acrylate-alkyl methacrylate copolymer having a weight average molecular weight of 100,000 to 2,000,000. The acrylic processing aid is not particularly limited, and examples thereof include n-butyl acrylate-methyl methacrylate copolymer and 2-ethylhexyl acrylate-methyl methacrylate-butyl methacrylate copolymer. These may be used alone or in combination of two or more. The impact modifier is not particularly limited, and examples thereof include methyl methacrylate-butadiene-styrene copolymer (MBS), chlorinated polyethylene, and acrylic rubber. The heat resistance improver is not particularly limited, and examples thereof include α-methylstyrene type and N-phenylmaleimide type.

The antioxidant is not particularly limited,
Examples include phenolic antioxidants. The light stabilizer is not particularly limited, and examples thereof include a hindered amine-based light stabilizer and the like. The ultraviolet absorber is not particularly limited, and examples thereof include salicylate-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers.
The above-mentioned pigment is not particularly limited, and examples thereof include azo-based, phthalocyanine-based, slene-based, dye lake-based and other organic pigments; oxide-based, molybdenum chromate-based, sulfide / selenide-based, ferrocyanide-based pigments, and the like. Examples include inorganic pigments.

Further, a plasticizer may be added to the above vinyl chloride resin for the purpose of improving processability during molding. The plasticizer is not particularly limited, and examples thereof include dibutyl phthalate, di-2-ethylhexyl phthalate, and di-2-ethylhexyl adipate.

The method of mixing the above additives with the vinyl chloride resin is not particularly limited, and examples thereof include a hot blending method and a cold blending method. The molding method for obtaining a vinyl chloride resin molded article using the above vinyl chloride resin is not particularly limited and may be appropriately selected depending on the molded article. Specific methods include an extrusion molding method and an injection molding method. A roll molding method, a blow molding method, a press molding method, a calender molding method and the like can be mentioned.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION (Examples 1 to 4, Comparative Examples 1 to 7)
According to the formulation table in Table 1, predetermined amounts of predetermined vinyl chloride resin, stabilizer, lubricant and inorganic filler were put into a 20 L super mixer (manufactured by Kawata Co., Ltd.) and mixed for 5 minutes. Next, an 8-inch mixing roll (produced by Yasuda Seiki Seisakusho) was kneaded at a temperature of 200 ° C. for 3 minutes to obtain a roll sheet. The obtained roll sheet was preheated at a temperature of 205 ° C. for 3 minutes with a hydraulic forming machine (manufactured by Toho Machinery Co., Ltd.) and a pressure of 9.8M.
After pressurizing at Pa for 3 minutes, it was cooled to obtain a press plate having a thickness of 3 mm.

The following evaluations were carried out using the obtained press plate. The results are shown in Table 1.

1) Tensile Yield Strength The tensile yield strength was measured according to JIS K 7113 at 20 ° C. and a tensile speed of 10 mm / min. 2) Tensile breaking elongation Based on JIS K 7113, it was performed at 20 ° C. and a pulling speed of 10 mm / min. 3) Impact resistance A test piece was prepared according to JIS K 7111, and the Charpy impact strength was measured at 20 ° C. with an edgewise impact test piece.

[0031]

[Table 1]

[0032]

As described above, the vinyl chloride resin composition of the present invention comprises 100 parts by weight of a vinyl chloride resin having a polymerization degree of 600 to 1600 and 20 to 50 parts by weight of at least two kinds of inorganic fillers. Since it is contained, it has excellent impact resistance without deteriorating the physical properties (tensile strength, tensile breaking elongation) inherent to the vinyl chloride resin, and is therefore suitably used for molded articles. Moreover, since the molded product of the present invention comprises the above vinyl chloride resin composition, it has excellent tensile strength, tensile fracture elongation, and impact resistance.

Continued front page    F-term (reference) 4F071 AA14X AA22X AA24 AA24X                       AA25X AA26X AA28X AA30X                       AA33X AA37X AA76 AA77                       AB21 AB30 AD02 AD06 AE17                       AF15 AF23 BB04 BC03                 4J002 BD041 BD051 BD081 BD091                       DE236 DJ047 FD016 FD017

Claims (6)

[Claims] 1. A vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin having a degree of polymerization of 600 to 1600 and 20 to 50 parts by weight of at least two kinds of inorganic fillers. . 2. The vinyl chloride resin composition according to claim 1, wherein the inorganic filler comprises a granular inorganic material and a layered inorganic material. 3. The vinyl chloride resin composition according to claim 1, wherein the granular inorganic material is contained in a larger amount than that of the layered inorganic material. 4. The vinyl chloride resin composition according to claim 1, wherein the average particle size of the granular inorganic material is 1 to 10 μm. 5. The vinyl chloride resin composition according to claim 1, wherein the granular inorganic material is calcium carbonate and the layered inorganic material is talc. 6. A vinyl chloride resin molded article using the vinyl chloride resin composition according to claim 1.